package com.edu.jsu.egoumail.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.edu.jsu.egoumail.common.utils.PageUtils;
import com.edu.jsu.egoumail.common.utils.Query;

import com.edu.jsu.egoumail.product.dao.CategoryDao;
import com.edu.jsu.egoumail.product.entity.CategoryEntity;
import com.edu.jsu.egoumail.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        // 1、查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        // 2、组装成父子树形结构
        List<CategoryEntity> level1Menus;
        level1Menus = entities
                .stream()
                .filter(categoryEntity -> categoryEntity.getParentCid() == 0)
                .map( menu ->{
                    menu.setChildren(getChildrens(menu,entities));
                    return  menu;
                })
                .sorted(Comparator.comparingInt(menu -> (menu.getSort() == null ? 0 : menu.getSort())))
                .collect(Collectors.toList());
        return level1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 1.检查当前删除的菜单是否被别的地方应用
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>();
        CategoryEntity byId = this.getById(catelogId);
        List<Long> parentPath = findParentPath(catelogId, paths);
        Collections.reverse(parentPath);
        return (Long[]) parentPath.toArray();
    }

    private List<Long> findParentPath(Long catelogId,List<Long> paths){
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if (byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;
    }

    /**
     * 递归查找当前菜单子菜单
     * @param root
     * @param all
     * @return
     */
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> children = all
                .stream()
                .filter(categoryEntity -> {
                    return  categoryEntity.getParentCid() == root.getCatId();
                })
                .map(categoryEntity ->{
                   categoryEntity.setChildren(getChildrens(categoryEntity,all));
                   return  categoryEntity;
                })
                .sorted((menu1,menu2)->{
                    return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
                })
                .collect(Collectors.toList());
        return  children;
    }

}